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Differential D20674 Diff 58741 lib/libkvm/kvm_getswapinfo.c

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lib/libkvm/kvm_getswapinfo.c

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#include <string.h> #include <string.h>
#include <unistd.h> #include <unistd.h>
#include <limits.h> #include <limits.h>
#include "kvm_private.h" #include "kvm_private.h"
static struct nlist kvm_swap_nl[] = { static struct nlist kvm_swap_nl[] = {
{ .n_name = "_swtailq" }, /* list of swap devices and sizes */ { .n_name = "_swtailq" }, /* list of swap devices and sizes */
{ .n_name = "_dmmax" }, /* maximum size of a swap block */
{ .n_name = NULL } { .n_name = NULL }
}; };
#define NL_SWTAILQ 0 #define NL_SWTAILQ 0
#define NL_DMMAX 1
static int kvm_swap_nl_cached = 0; static int kvm_swap_nl_cached = 0;
static int unswdev; /* number of found swap dev's */ static int unswdev; /* number of found swap dev's */
static int dmmax;
static int kvm_getswapinfo_kvm(kvm_t *, struct kvm_swap *, int, int); static int kvm_getswapinfo_kvm(kvm_t *, struct kvm_swap *, int, int);
static int kvm_getswapinfo_sysctl(kvm_t *, struct kvm_swap *, int, int); static int kvm_getswapinfo_sysctl(kvm_t *, struct kvm_swap *, int, int);
static int nlist_init(kvm_t *); static int nlist_init(kvm_t *);
static int getsysctl(kvm_t *, const char *, void *, size_t);
#define KREAD(kd, addr, obj) \ #define KREAD(kd, addr, obj) \
(kvm_read(kd, addr, (char *)(obj), sizeof(*obj)) != sizeof(*obj)) (kvm_read(kd, addr, (char *)(obj), sizeof(*obj)) != sizeof(*obj))
#define KGET(idx, var) \ #define KGET(idx, var) \
KGET2(kvm_swap_nl[(idx)].n_value, var, kvm_swap_nl[(idx)].n_name) KGET2(kvm_swap_nl[(idx)].n_value, var, kvm_swap_nl[(idx)].n_name)
#define KGET2(addr, var, msg) \ #define KGET2(addr, var, msg) \
if (KREAD(kd, (u_long)(addr), (var))) { \ if (KREAD(kd, (u_long)(addr), (var))) { \
_kvm_err(kd, kd->program, "cannot read %s", msg); \ _kvm_err(kd, kd->program, "cannot read %s", msg); \
▲ Show 20 Lines • Show All 49 Lines • ▼ Show 20 Lineskvm_getswapinfo_kvm(kvm_t *kd, struct kvm_swap *swap_ary, int swap_max,
if (!nlist_init(kd)) if (!nlist_init(kd))
return (-1); return (-1);
bzero(&tot, sizeof(tot)); bzero(&tot, sizeof(tot));
KGET(NL_SWTAILQ, &swtailq); KGET(NL_SWTAILQ, &swtailq);
sp = TAILQ_FIRST(&swtailq); sp = TAILQ_FIRST(&swtailq);
for (i = 0; sp != NULL; i++) { for (i = 0; sp != NULL; i++) {
KGET2(sp, &swinfo, "swinfo"); KGET2(sp, &swinfo, "swinfo");
ttl = swinfo.sw_nblks - dmmax; ttl = swinfo.sw_nblks;
if (i < swap_max - 1) { if (i < swap_max - 1) {
bzero(&swap_ary[i], sizeof(swap_ary[i])); bzero(&swap_ary[i], sizeof(swap_ary[i]));
swap_ary[i].ksw_total = ttl; swap_ary[i].ksw_total = ttl;
swap_ary[i].ksw_used = swinfo.sw_used; swap_ary[i].ksw_used = swinfo.sw_used;
swap_ary[i].ksw_flags = swinfo.sw_flags; swap_ary[i].ksw_flags = swinfo.sw_flags;
GETSWDEVNAME(swinfo.sw_dev, swap_ary[i].ksw_devname, GETSWDEVNAME(swinfo.sw_dev, swap_ary[i].ksw_devname,
flags); flags);
} }
tot.ksw_total += ttl; tot.ksw_total += ttl;
tot.ksw_used += swinfo.sw_used; tot.ksw_used += swinfo.sw_used;
sp = TAILQ_NEXT(&swinfo, sw_list); sp = TAILQ_NEXT(&swinfo, sw_list);
} }
if (i >= swap_max) if (i >= swap_max)
i = swap_max - 1; i = swap_max - 1;
if (i >= 0) if (i >= 0)
swap_ary[i] = tot; swap_ary[i] = tot;
return(i); return(i);
} }
#define GETSYSCTL(kd, name, var) \
getsysctl(kd, name, &(var), sizeof(var))
/* The maximum MIB length for vm.swap_info and an additional device number */ /* The maximum MIB length for vm.swap_info and an additional device number */
#define SWI_MAXMIB 3 #define SWI_MAXMIB 3
int int
kvm_getswapinfo_sysctl(kvm_t *kd, struct kvm_swap *swap_ary, int swap_max, kvm_getswapinfo_sysctl(kvm_t *kd, struct kvm_swap *swap_ary, int swap_max,
int flags) int flags)
{ {
int ti; int ti;
swblk_t ttl; swblk_t ttl;
size_t mibi, len; size_t mibi, len;
int soid[SWI_MAXMIB]; int soid[SWI_MAXMIB];
struct xswdev xsd; struct xswdev xsd;
struct kvm_swap tot; struct kvm_swap tot;
if (!GETSYSCTL(kd, "vm.dmmax", dmmax))
return -1;
mibi = SWI_MAXMIB - 1; mibi = SWI_MAXMIB - 1;
if (sysctlnametomib("vm.swap_info", soid, &mibi) == -1) { if (sysctlnametomib("vm.swap_info", soid, &mibi) == -1) {
_kvm_err(kd, kd->program, "sysctlnametomib failed: %s", _kvm_err(kd, kd->program, "sysctlnametomib failed: %s",
strerror(errno)); strerror(errno));
return -1; return -1;
} }
bzero(&tot, sizeof(tot)); bzero(&tot, sizeof(tot));
for (unswdev = 0;; unswdev++) { for (unswdev = 0;; unswdev++) {
Show All 12 Lines if (len != sizeof(xsd)) {
return -1; return -1;
} }
if (xsd.xsw_version != XSWDEV_VERSION) { if (xsd.xsw_version != XSWDEV_VERSION) {
_kvm_err(kd, kd->program, "struct xswdev version " _kvm_err(kd, kd->program, "struct xswdev version "
"mismatch; kernel and libkvm out of sync?"); "mismatch; kernel and libkvm out of sync?");
return -1; return -1;
} }
ttl = xsd.xsw_nblks - dmmax; ttl = xsd.xsw_nblks;
if (unswdev < swap_max - 1) { if (unswdev < swap_max - 1) {
bzero(&swap_ary[unswdev], sizeof(swap_ary[unswdev])); bzero(&swap_ary[unswdev], sizeof(swap_ary[unswdev]));
swap_ary[unswdev].ksw_total = ttl; swap_ary[unswdev].ksw_total = ttl;
swap_ary[unswdev].ksw_used = xsd.xsw_used; swap_ary[unswdev].ksw_used = xsd.xsw_used;
swap_ary[unswdev].ksw_flags = xsd.xsw_flags; swap_ary[unswdev].ksw_flags = xsd.xsw_flags;
GETSWDEVNAME(xsd.xsw_dev, swap_ary[unswdev].ksw_devname, GETSWDEVNAME(xsd.xsw_dev, swap_ary[unswdev].ksw_devname,
flags); flags);
} }
Show All 21 Lines if (kvm_nlist(kd, kvm_swap_nl) < 0)
return (0); return (0);
/* Required entries */ /* Required entries */
if (kvm_swap_nl[NL_SWTAILQ].n_value == 0) { if (kvm_swap_nl[NL_SWTAILQ].n_value == 0) {
_kvm_err(kd, kd->program, "unable to find swtailq"); _kvm_err(kd, kd->program, "unable to find swtailq");
return (0); return (0);
} }
if (kvm_swap_nl[NL_DMMAX].n_value == 0) {
_kvm_err(kd, kd->program, "unable to find dmmax");
return (0);
}
/* Get globals, type of swap */
KGET(NL_DMMAX, &dmmax);
kvm_swap_nl_cached = 1; kvm_swap_nl_cached = 1;
return (1);
}
static int
getsysctl(kvm_t *kd, const char *name, void *ptr, size_t len)
{
size_t nlen = len;
if (sysctlbyname(name, ptr, &nlen, NULL, 0) == -1) {
_kvm_err(kd, kd->program, "cannot read sysctl %s:%s", name,
strerror(errno));
return (0);
}
if (nlen != len) {
_kvm_err(kd, kd->program, "sysctl %s has unexpected size", name);
return (0);
}
return (1); return (1);
} }